Implement for truing the ends of tubing.



PATENTED MAR. 22,1904.

E. 1). WEBB.

IMPLEMENT FOR TRUING THE ENDS 0F TUBING.

APPLICATION FILED AUG. 25, 1903.

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UNITED STATES Patented March 22, 1904.

EDWARD D. WEBB, OF CHESTER, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO'FRANCIS A. FORWOOD, OF CHESTER, PENNSYLVANIA.

IMPLEMENT FOR TRUING THE ENDS OF TUBING- SPECIFICATION forming part of Letters Patent No. 755,198, dated March 22, 1904.

Application filed August 25, 1903.

To all whom it may concern:

Be it known that I, EDWARD D.W BB, a citizen of the United States, residing in the city of Chester, county of Delaware, and State of Pennsylvania, have invented a new and useful implement for truing the ends of tubing to exact circular form and thereby facilitating the more perfect threading of screws thereon, of which the following is a specification.

This invention relates to the operation of screw-threading tubing, and is more especially applicable to the kind of tubing known as casings, in which the ends of tubing to be threaded often vary from true cylindric form and which in screw-threading fail in parts to produce full screw-threads, and thereby impair the fluid-tightness of the joints in which such screw-threads are involved.

The object of this invention is to expand and hold the ends of tubes in true cylindric form during the thread-cutting operation; and to this end it consists in a series of rollers having tapering ends arranged to fit inside of tubes and means of supporting said rollers in such position as to hold the pipe or tube in exactly cylindric form and present it centrally to the action of the dies of thread-cutting machinery.

The construction of this improved implement is shown in the accompanying drawings, in which- 7 Figure 1 shows a front view of it as applied in the end of a tube; Fig. 2, a rear View thereof. Fig. 3 is acentral lengthwise section thereof. Fig. 1 is a rear view of a modified form, and Fig. 5 is a central lengthwise section of the form shown in Fig. A. 1

Referring to the drawings, 1 is a central body of such dimensions as to easily enter the end of a tube to be trued up. In thisbody 1 are a series of equidistant radial slots 2, in each of which is fitted a bearing 3, supporting a roller 4: on journals 5 and 6, so that the roller imay turn freely in the bearing 3. The rollers 4 Serial No. 170,731. (No model.)

have cylindric faces 7 through the principal part of their length, with tapering ends 8, so that they may be easily entered into the tube 9. As shown in Figs. 1, 2, and 3, set-screws 10 are fitted through the body 1 from a central cavity 11, so as to bear against the bearing 3 and force the same outwardly into-proper adjustment to fit the internal surface of a true pipe.

As shown in Figs. 4 and 5, the bearings 3 have grooves 12 formed in them, into which tapering keys 13 are fitted, which, being driven into proper adjustment and retained by friction. in the grooves 12, hold and force the bearings 3 outwardly and serve to adjust the rollers 4 to fit in a true circle.

In using this implement a ring of pipe 9 is placed in a true cylindric clamp 14 (shown in Fig. 1) and held therein in accurately true form. The tool is then pushed into the ring of. pipe 9, and the set-screws 10 or the keys 13, as the case may be, are set outwardly, so as to force the rollers 1 into intimate contact with the inner surface of the pipe 9. The tool is then ready for use and is introduced in the end of a tube to be threaded in a pipethreading machine, and the pipe revolves around the tool. held in true cylindric form during the cutting operation, thus presenting the exterior of the tube to the action of the die equally on all sides and producing full threads throughout the entire circumference of the tube.

Having described my invention, what I claim is.

1. In an implement for holding the ends of tubes in true cylindric form during the operation of cutting screw-threads thereon, a body having a plurality of radial equidistant slots means for holding said body against rotation Within the tube, a bearing fitted radially adjustably in each slot and separate and independent means for adjusting radially each bearing in each slot rollers having cylindric slot containing said bearing to independently I adjust each bearing and roller in radial direction as set forth.

his EDWARD X D. WEBB.

mar

Witnesses:

S. LLOYD WIEGAND, IRA STovER MYERS. 

